Tech employees may be the big winners of the ETF explosion. Tech employees - who often receive a large portion of their compensation in stock options - are the big winners of the exchange-traded fund market's $5 trillion explosion, according to a new study from Vincent Deluard of INTL FCStone.

Ethereum tumbles to a 16-month low. The cryptocurrency fell more than 8% early Wednesday to $169.12 a coin and has lost more than 30% of its value over the past seven days.

Apple's iPhone event is here. The tech giant is expected to unveil three new iPhones and a slew of other products at an event in Cupertino, California, on Wednesday that may also include a new Apple Watch and refreshed Air Pods.